New York Natural Heritage Program
Tooth-cup
Rotala ramosior (L.) Koehne
Dicots
Family: Loosestrife Family (Lythraceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G5
A Global Rarity Rank of G5 means: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
This is by far our smallest plant in the loosestrife family in New York. The genus name means wheel and comes from the whorled leaves of some of the species that look like the spokes of a wheel. The species name means many-branched and refers to its habit (Fernald, 1970). This is the only species of the genus in the Western Hemisphere but some other old world species are popular aquarium plants.

State Ranking Justification [-]
There are 10 existing populations but only four of these have more than 100 plants. There is one large population of over 2000 plants. The other populations are somewhat small and subject to human disturbance. Most of the 10 or so historical records are from developed areas of western Long Island and Staten Island and are considered extirpated. A few more populations may be found on eastern Long Island.

Short-term Trends [-]

Long-term Trends [-]